Air pump



FIG. 1 is a front, right side, top perspective view of an air pump showing my new design;

FIG. 2 is a rear, left side, bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is the left side elevation view thereof rotated 180 degrees; and,

FIG. 8 is a right side view thereof.

The broken lines immediately adjacent to the claimed portions are boundaries, all the broken lines depict portions of the air pump and form no part of the claimed design. 

CLAIM The ornamental design for an air pump, as shown and described. 